“These are terrorist attacks that have only one goal: to kill people indiscriminately and arbitrarily and to spread fear,” Chancellor Angela Merkel’s spokesman Steffen Seibert told a government press conference.
Merkel’s government stressed “Israel’s right to self-defence against these attacks”, he added.
Palestinian militants have launched more than 1,800 rockets since Monday, according to Israel’s army, which has launched hundreds of air strikes on Hamas and other Islamist groups in the crowded coastal enclave of Gaza.
The most intense hostilities in seven years were triggered by weekend unrest at Jerusalem’s Al-Aqsa mosque compound, which is sacred to both Muslims and Jews.
Germany has seen scattered demonstrations this week over the escalating conflict, with protesters shouting anti-Semitic slogans and burning Israeli flags.
Flags were burned outside synagogues in Münster and Bonn, with 16 people arrested.
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On Wednesday evening, around 180 people shouted anti-Jewish slogans at a march in Gelsenkirchen, also in the west.
On Thursday around 1,500 people gathered in the northern city of Bremen calling for “freedom for Palestine” in a protest which proceeded without incident, according to local police. Seibert said Friday that Germany would not tolerate “anti-Semitic” demonstrations.
“Anyone who attacks a synagogue or defiles Jewish symbols shows that for them it is not about criticising a state or the policies of a government, but about aggression and hate towards a religion and the people who belong to it,” he said.
German President Frank-Walter Steinmeier had on Thursday also condemned the protests.
“Those who burn Star of David flags in our streets and shout anti-Semitic slogans not only abuse the freedom to demonstrate, but are committing crimes,” he told the popular Bild daily.
“Nothing justifies threats against Jews in Germany or attacks on synagogues in German towns,” he said.